heating quartz for smashing

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heating quartz for smashing

Post by martinjsto on Sun 09 Aug 2015, 2:36 pm

i heard you can put quartz in a fire and heat it so it will crush easier, anyone have any info or a guide to doing this
cheers

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Re: heating quartz for smashing

Post by araratgold on Sun 09 Aug 2015, 3:54 pm

Gidday Martin,

That is true !

I have put large species in the home oven, cranked it up with the grill on also.
Gave it about 20 minutes then dropped it into a tub of cold water. Hey presto, quartz has become brittle.

The oldtimers also used to do it before putting the quartz through the crusher to make it more brittle.

Cheers,
Rick
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Re: heating quartz for smashing

Post by martinjsto on Sun 09 Aug 2015, 6:54 pm

cheers Rick, i have a fair bit to do so this will make the task easier, now to let the missus know i need the oven for a few days. affraid

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Re: heating quartz for smashing

Post by NuggieDreamer on Mon 10 Aug 2015, 8:02 pm

martinjsto wrote:i heard you can put quartz in a fire and heat it so it will crush easier, anyone have any info or a guide to doing this
cheers

build a small scale 'Roasting Kiln' like they use to do it Very Happy


( from http://www.egold.net.au/ )
In the very early days of quartz mining, crushing machines were relatively light, and kilns were used to roast quartz, to soften it prior to crushing (ed. and help release gold from mineralized pyritic ore.) The quartz was added to the kilns, of variable construction, in layers, interspersed with layers of fuel. The quartz was roasted as the fire worked upwards, and the product was shovelled out from below.
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Re: heating quartz for smashing

Post by martinjsto on Mon 10 Aug 2015, 9:01 pm

good idea, thanks Nuggiedreamer. Very Happy

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Re: heating quartz for smashing

Post by Bignuggs on Wed 12 Aug 2015, 5:25 pm

How much have you been able to extract out of the quartz so far.
There was some good lookin gold in the rock.
cheers
Cliff

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Re: heating quartz for smashing

Post by martinjsto on Wed 12 Aug 2015, 6:08 pm

hi Cliff, i have finished the last specimen today and got a total of 62.28 grams of gold. 6.8 grams was in nuggets so 56 grams from the specimens including the crystal one i have not smashed. certainly a great trip.
I have not looked at my load of fool's gold specimens yet so there maybe a bit in them but i doubt it. clown
cheers

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Re: heating quartz for smashing

Post by Stingray on Wed 12 Aug 2015, 8:24 pm

Well done Martin, bet it looked good in the pan when you cleaned up! Just wondering if you cooked the quartz or just smacked it up as is?

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Re: heating quartz for smashing

Post by martinjsto on Wed 12 Aug 2015, 10:08 pm

sure does stingray, nothing better than a pan full of gold, i did fire some of it and tried it in my rock crusher but it didnt like the hard quartz so a redesign is in order, most i just smashed in the dolly pot. after finishing i put all the dregs back into the pan to see what i missed and got another 0.8 grams that floated out of the pan on the first run so it pays to do it twice. Very Happy

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Re: heating quartz for smashing

Post by Stingray on Thu 13 Aug 2015, 9:07 pm

Hi Martin, after I saw your home made crusher I had a look around on the internet and found someone who had welded a round lump of steel to the end of a small jackhammer bit and used it as an electric dolly in a dolly pot. Good idea I thought - I've got one of those cheap Ozito 'jackhammers' from Bunnings and reckon it should work OK with that.

It might be a simple solution for you seeing you'll have a sh*t load of quartz species to process when you get back from your next trip!.

Cheers and good luck
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